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#18
March 29th 08, 03:31 PM
posted to rec.radio.shortwave
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900 kHz Image Problem with the Longwave Bands even on a GrundigG5 receiver
Radioguy wrote:
On Mar 27, 9:24 am, dave wrote: gccradioscience wrote: If you live in a city area or some rural area with a real strong AM station its likely it will be found on the longwave bands from 150 to 519 kHz (1050 kHz to 1419 kHz) the 900 kHz carrier image. Please understand that this station is not a real longwave radio station. Its a image from the broadcast station when the station is strong enough to bleed on other longwave frequencies. The radios that I have is the DX-380, DX-390, DX-392 and the yes the new Grundig G5. It has do something with the dual conversion circuitry . I am hoping that manufactuers, hobbyists, and technicians will use the 900 kHz formula to see other image stations to show that these AM stations should not be on the LW bands. Desired AM Station (kHz) - 900 kHz = Image Station The images I am getting here locally in Virginia Beach, VA on LW is 150 kHz = 1050 kHz WVXX -AM 210 kHz = 1110 kHz WYRM-AM 330 kHz = 1230 kHz WJOI -AM 410 kHz = 1310 kHz WGH-AM 450 kHz = 1350 kHz WGPL -AM 500 kHz = 1400 kHz WPCE-AM AM Band Images that are annoying 550 kHz = 1450 kHz 650 kHz = 1550 kHz Adam E. It's a single-conversion phenomenom usually. Two times the IF, + or - the FOI.- Hide quoted text - - Show quoted text - And the owner of that inexpensive radio has a couple of options: 1. Live with the repeats and realize that Radio Havana will likely not recognize a DX catch on 5100 khz. Owners of most inexpensive radios just ignore the stuff that doessn't make much sense. My Degen DE1103 shows repeats of strong stations 900 khz down (2x the IF). 2. Buy a better receiver. Or an MFJ-956 |
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